 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.core;
  
 import org.eclipse.core.runtime.*;

 /**
  * Convenience implementation of a verifier.
  * <p>
  * This class may be subclassed by clients.
  * </p>
  * <p>
  * <b>Note:</b> This class/interface is part of an interim API that is still under development and expected to
  * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
  * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
  * (repeatedly) as the API evolves.
  * </p>
  * @see org.eclipse.update.core.IVerifier
  * @since 2.0
  */
 public abstract class Verifier implements IVerifier {
     
     private IVerifier parent;

     /**
      * @see IVerifier#verify(IFeature, ContentReference, boolean, InstallMonitor)
      */
     public abstract IVerificationResult verify(
         IFeature feature,
         ContentReference reference,
         boolean isFeatureVerification,
         InstallMonitor monitor)
         throws CoreException ;

     /**
      * @see IVerifier#verify(IFeature, ContentReference, boolean, InstallMonitor)
      */
     public void setParent(IVerifier parentVerifier){
         if (this.parent==null){
             this.parent = parentVerifier;
         }
     }
     
     /**
      * Returns the parent verifier
      *
      * @return the parent verifier
      * @since 2.0
      */
     public IVerifier getParent(){
         return parent;
     }

 }

